1.
De mierenfauna van België (Hymenoptera: Formicidae).
2.
Contribution à l'étude du régime alimentaire de la chouette chevêche (Athena noctua) en Belgique ; Diet of the little owl (Athena noctua) in Belgium
3.
4.
5.
6.
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8.
Studies on the fauna of Curaçao, Aruba, Bonaire and the Venezuelan islands: no. 14. Ants from the Leeward group and some other Caribbean localities.
Flowers and Shells
Vase of Flowers on a Garden Ledge
Posy of Flowers on a marble Ledge: Detail of flower bulb and wasp
Posy of Flowers on a marble Ledge
Flowers in a glass Vase, on a marble Pedestal
Fall of Man
Flowers in a Glass Vase in a Niche